Thermostat.



J. BROMBACHER.

THERMOSTAT. 7 APPLICATION FILED JUNE 12. I915. 1 ,202.,962. Patented Oct. 31,1916.

' 2 SHEETS-SHEET 1- J. BROMBAC'HEW.

THERMOSTAT.

APPLICATION FILED JUNE 12, 1915.

1 02,962. Patented Oct. 31, 1916.

Z SHEETS-SHEET 2- JULIUS BEOMB ACHER, OF LOS ANGELES, CALIFORNIA.

naeaeea To all whom it may concern:

' cation.

the burners ot a water heater, wherein,

Be it known that I, JU IUS BROMBAGHER, a citizen of the United States, residing at Los Angeles, in the'county of Los Angeles and State of California, have invented a certain new and useful-Improvement in Thermostats, of which the following is a specifi- Thisinvention relates to a device for the automatic regulation of a valve, and has especial reference to a thermostatic control.

for governing in consequence may be made in a more or less mitting any gas to boiler sediment may collect without interfercrude manner, whereby to eliminate all delicacy of movement and obviate the necessity for constructional precision.

Further objects of my invention are to provide a thermostatic control in which all parts are readily accessible and adjustable without dissociating them and without perescape, and in which ing with the operation.

Other objects will appear from the subjoined specification in connection with the accompanying drawings, in which, I

Figure 1, is an end view. Fig. 2, is a section on lines 2-2, Fig. 1, and Fig. 3, is a side elevation.

My invention consists of a valve housing 1, having'in the interior and integral with the bottom thereof, a cylindrical wall 2, spaced from the housing, and forming a gas passage-way in communication with which is a ported extension 3, through which gas may be supplied to a burner, not shown. The top of said cylindrical wall 2, forms a seat for a double acting valve 4, the stem 5, of which extends and operates in a bored boss 6, integral with said housingl. This valve comprises an annular'disk, having on the underside an annular acuminate ridge 7, arranged for engaging the top of said cylindrical wall and being diametrically smaller than the disk, which is diametrically greater than the cylindrical wall 2, to prevent the entrance of foreign matters into the passage-way formed specification of Letters Patent.

Patented oct. er, rare.

Application filed dune 12, 1915. serial No. 34,321.

by saidwall. On its upper side, the disk is formed with a peripheral acuminate ridge 8, for engagement with an annular seat 9, integral with the cap 10, having threaded engagement with said housing 1, and provided with a tubular gas inlet extension 11,

threaded preferably internally and externally. In said cap 10, is a chambered recess, 12, forming a guide for a plurality of fingers 13, on said valve disk, the stem 5, of which is held in engagement with an adjustable memher, as a screw 14, also extending and operatlng in said bored boss 6, by. a spring 15. The cylindrical wall 2, is provided with a port 16, for the passage of gas into the chamher formed by'said cylindrical wall to supply gas for the pilot, when the heater is'not in operation, and when the valve 4, is seated on the top of the cylindrical wall, as hereinafter described, the quantity of gas passing through said port 16, being regulated by a needle valve 17, adjustable from the outside of the housing and held in adjusted position by a lock nut 18. Integral with the housing is a. plpe or tube-connection, 19,-having a nut-portion 20, for a wrench in threading the connection and its complementary valve housing 1, into a thermostatic pipe or tube 21, having water circulating pipe-extensions 25and 26, shown in Fig. 3. The security of. the joint between the connection 19, and the thermostatic tube 21, is insured by a screw 22, engaging a lug 23, on the nut-portion 20, and a lug 24, on the tube 21.

The freeend of the thermostatic tube 1s provided with a depending bracket 27, having a socket 2 8, for the reception of one end of a rod29,the other end of which rests loosely in asocket 30, in one arm 31, of a bell-crank lever, fulcrumed in cars 31, on

the underside of said connection 19. The.

end of the other arm 32, of said bell crank lever is -split to form a clamp 33, that is provided with interior threads for engagement by the screw 14, operating the valve stem 5, and which screw is held in position after adjustment by a clamp bolt 34.

In the position of the valve, as shown in Fig. 2, the gas is flowing freely through the cylindrical walltothe burners and the heater is in operation. When the temperature of the water flowing through the thermostatic tube rises, the resulting expansion of the thermostatic tube causes the bell crank lever with its valve operating screw 14, to move downwardly, simultaneous with which movethrough the rod 29, operates the bell crank ment the ridge 7, of the valve is forced closer to the top of the cylindrical wall by the spring 15, thus gradually reducing the quantity of gas, flowing through the passage-way formed by said cylindrical wall, and eventually completely shutting off the flame, upon the seating of the valve ridge 7 which occurs when the highest temperature of the water is reached. Normally the ridge 7 of the valve is seated, and only a small flow of gas, suflicient for the pilot, permitted to pass through the port 16, in the cylindrical wall. This pilot light maintains the water at a temperature, at which, when the heater is not in operation, the thermostatic tube will.

remain passive. Obviously when cold water or water colder than that normally in the thermostatic tube is passed therethrough upon operating the heater, the contraction of the tube, transmitting its movement lever, which in turn unseats the valve and permits the gas to be supplied in quantities to the burners, the quantity corresponding to the temperature of the waterin, and the extent of contraction of, the thermostatic tube.

Should the pilot light be accidentally extinguished or blown out, the gas supplied for the pilot will be automatically cut off by the following described arrangement: Pivotally mounted in ears 35, cast on the underside of the valve housing 1, is a lever 36, having a curved end 37, arranged in operative relation to the operatin' screw 14, and 'a weighted end 38. Adjusta ly attached'to said weighted end 38, is a plate 39, which projects beyond the weighted end and in which projected end is journaled centrally a grooved roller 40. The lever 36, is held in the'inoperative position shown in Fig. 1, by the inclined toe 41, of atrigger 42, on which the roller 40 rests. This trigger 42 is fulcrumed in a bracket 43, riveted to an annulus 44. The upper end of said trigger 42, extends in a socket 45, formed in a thermostatic plate 46, having the same curvature as and rigidly fastened at one end to said annulus, this plate being located immediately over the burners.

. N ormall the expan'slon of the plate 46, forces and olds the too 41, of the trlgger 42,

in engagement with the underside of the roller 40. Whenthe pilot is accidentally.

so'doing, the curved end 37, of said lever strikes against' the screw and, lifting it, forces the valve ridge 8, in firm engagement with the seat 9, thus cutting oif entirely the flow of any gas. The normal expansion of the plate 36, is maintained by the pilot or full heating flame.

What I claim is A thermostat comprising a housi a vertically operating valve within said ousing, a horizontal tube associated with-said housing and forming part of the water circuit and influenced solely by the temperature of the water, a bell-crank fulcrumed on said housing, a member adjustably mounted in one end of said bell-crank and arranged in contact with said valve, a rod loosely carried at one end in said tube and at the other end in said bell-crank to transmit the expansive and contractive movements of said tube to said valve and regulate the flow of gas, a weighted lever fulcrumed on said housing and having its free end disposed in operative relation to said adjustable member, the weighted end of said lever having an adjustable plate provided with a roller, a fulcrumed trigger having one end arranged for engagement with said roller to hold said weighted lever in normally inoperative position, and-a plate influenced directly by the flame and having operative connection'with the other end of said trigger to hold same in engagement with said roller, said plate operable by contraction upon the extinguishment of the flame to disengage said trigger and allow said lever to drop, whereby the free end thereof engages said adjustable member and shuts off the flow of gas.

In testimony whereof I aflix my signature in the presence of two witnesses.

JULIUS BROMBACHER. Witnesses: r 

